68251. Which distortion is least objectionable in case of audio amplifiers?
68252. In a single stage differential amplifier, the output offset voltage is mainly dependent on the mismatch of
68253. A delay equalizer is a
68254. A cascade amplifier stage is equivalent to
68255. Which one of the following devices is not used as the controller in a stabilizer?
68256. The disadvantage of transformer coupling in amplifier is
68257. For an I/p of Vs = 5 sin ωt (assuming ideal diode), circuit shown in the figure will behave as a
68258. A transistor is said to be in a quiescent state when
68259. According to Barkhausen criteria in order to sustain the oscillations
68260. A Wien bridge oscillator uses
68261. In the above case, what will be the value of capacitor to obtain 100 kHz frequency?
68262. Equal amplitude ac signals are given as inputs to both inverting and given as inputs to both inverting and non-inverting terminals of an op-amp. The output will be zero when the phase difference between inputs is
68263. Which of the following can be used to isolate a low impedance from a high impedance source?
68264. A class C amplifier uses
68265. In figure
68266. A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz?
68267. The input to negative clamper has a peak value of Vp. Then in the output the positive and negative peaks are nearly
68268. Figure shows current pulses of a class C power amplifier. The fundamental frequency of these pulses is
68269. A FET has
68270. A TRIAC is a semiconductor device which acts as a
68271. The Clapp oscillator shown in figure will operate at
68272. In a Darlington pair
68273. Figure shows a zener circuit and characteristic of the zener used. If R2 is the lowest load resistance, then for proper voltage regulation R1 must be
68274. In CC configuration, the output signals has approximately
68275. The PIV of a bridge rectifier is less than that of full wave rectifier with centre tapped transformer.
68276. Zero bias works only with
68277. Which of the following uses a capacitor in the feedback path?
68278. In an inverting amplifier using op-amp the current input to the inverting terminal
68279. For a transistor the normal collector voltage is 12 V. If actually it is found to be + 28 V, the trouble could be
68280. In a CE transistor amplifier, when collector-emitter voltage increases
68281. In figure, VC is approximately equal to
68282. Which one of the following power amplifier has the maximum efficiency?
68283. Figure shows small signal model of CB amplifier circuit. Then I and R are respectively equal to
68284. The common emitter short circuit current gain β of a transistor
68285. A complementary symmetry amplifier has
68286. The units of are
68287. Negative feedback is used in audio amplifiers to
68288. A BJT amplifier has a power gain of 0.5 from source to base. The power gain in dB is
68289. A rectifier circuit has load resistance R. It uses a capacitance filter having capacitance C. For low ripple in the output
68290. In graphical analysis of BJT amplifier the slope of ac line is more than that of dc load line.
68291. Which circuit is called emitter follower?
68292. Logarithmic amplifiers are used in
68293. ”The principle of respect for all life and the practice of non-injury to living things’is known in India as:
68294. In figure VBE = 0.7 V. If base current required to saturate the transistor is 0.1 mA, Vi =
68295. As per miller theorem the circuit of figure (1) can be replaced by that in figure (2) If V1/V2 = K, then Y1 and Y2 are equal to
68296. In a biased JFET (Figure) the shape of the channel is as shown because
68297. Assertion (A): In class A amplifier the distortion is minimumReason (R): In class A amplifier collector current exists for 360° of input cycle
68298. Assertion (A): In a differential amplifier the current through common emitter resistor is called tail currentReason (R): CMRR of an op-amp indicates how a differential signal amplified
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